This page was created to possibly help others who don't understand endothermic and exothermic reactions as well as they want or need to. The basic definitions are easy to understand: Endothermic: a reaction or process which absorbs heat from its surroundings. Exothermic: a reaction or process which gives off heat to its surroundings. The problem comes in trying to state which specific examples of reactions are which, because usually a lot of things are going on at the same time.
A HillâSachs lesion, or HillâSachs fracture, is a cortical depression in the posterolateral head of the humerus. It results from forceful impaction of the humeral head against the anteroinferior glenoid rim when the shoulder is dislocated anteriorly.
Shoulder impingement is a soft tissue injury. It occurs when the scapula rubs or pressures the rotator cuff, causing increasing damage, pain, and loss of range of motion. Impingement starts when the shoulder sustains trauma or injury leading to compression of the soft tissue under the acromion. The soft tissue (rotator cuff muscles, tendons, and bursa) are located between the acromion and the head of the humerus. This area is called the sub-acromial space.